Analysis and solution of powder coating problems

China Paint Online News Information:
In the process of spraying, powder flow is not good reasons and solutions:
1) compressed air pressure is not enough, you can check the compressed air supply, clean air filtration equipment, appropriate increase the pressure.
2) microplate is blocked, check whether the microplate is blocked by ultra-fine powder or compressed air oil, impurities.
3) Powder stored in the powder supply barrel for a long time to absorb moisture, can try to increase the air pressure for a long time to vulcanize the powder, take away moisture, if necessary, with a clean appliance to help stir.
4) powder lumps, the powder can be manually loosened through the sieve.
5) Too much powder in the vulcanized bed can reduce the amount of powder in the bed, the amount of powder is generally added to two-thirds of the volume of the vulcanized bed.
powder coating curing surface hardness is not good reasons and solutions:
1) curing is insufficient, can raise the baking temperature, so that it meets the process requirements or extend the process baking time, so that it meets the process requirements.
2) over-curing, coating brittleness will also reduce the hardness, can appropriately reduce the baking temperature, shorten the baking time.
3) Baking heating rate is too slow, in the slow melting flow process, some leveling aids migrate to the upper float, can improve the heating rate to the coating surface.4) The powder itself has a quality problem and the powder supplier can be notified to improve the formulation.
the reasons and solutions for film color change after the solidification of the powder coating:
1) baking time is too long, can shorten the baking time.
2) The baking temperature is too high to reduce the baking temperature.
3) coating thickness is uneven.
a) the gun position or direction is not correct, affected by the Faraday effect, etc., should check and reset the spray gun,
b) automatic gun vibrator does not match the speed of the production line, should adjust the production line speed or adjust the gun vibrator travel;
c) spray powder Air flow in the chamber affects the injection range of the powder, should contact the equipment supplier,
d) spray gun powder is not uniform, should check the powder supply and spray gun system, to ensure that powder vulcanization and atomization is uniform,
e) high voltage instability should check the output voltage.
4) The air in the oven is not clean and the air heating system and exhaust should be checked.
5) If there is a problem with the powder formulation, contact the powder supplier.
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